cogl: Use a CoglBitmask to store the list of used texcoord arrays

Instead of directly using a guint32 to store a bitmask for each used
texcoord array, it now stores them in a CoglBitmask. This removes the
limitation of 32 layers (although there are still other places in Cogl
that imply this restriction). To disable texcoord arrays code should
call _cogl_disable_other_texcoord_arrays which takes a bitmask of
texcoord arrays that should not be disabled. There are two extra
bitmasks stored in the CoglContext which are used temporarily for this
function to avoid allocating a new bitmask each time.

http://bugzilla.openedhand.com/show_bug.cgi?id=2132

cogl/cogl-context.c

@@ -97,7 +97,9 @@ cogl_create_context (void)
           0, sizeof (CoglMaterialFlushOptions));
   _context->current_layers = g_array_new (FALSE, FALSE,
                                           sizeof (CoglLayerInfo));
-  _context->texcoord_arrays_enabled = 0;
+  _cogl_bitmask_init (&_context->texcoord_arrays_enabled);
+  _cogl_bitmask_init (&_context->temp_bitmask);
+  _cogl_bitmask_init (&_context->texcoord_arrays_to_disable);
 
   _context->framebuffer_stack = _cogl_create_framebuffer_stack ();
 
@@ -201,6 +203,10 @@ _cogl_destroy_context ()
   if (_context->atlas_texture)
     cogl_handle_unref (_context->atlas_texture);
 
+  _cogl_bitmask_destroy (&_context->texcoord_arrays_enabled);
+  _cogl_bitmask_destroy (&_context->temp_bitmask);
+  _cogl_bitmask_destroy (&_context->texcoord_arrays_to_disable);
+
   g_free (_context);
 }
 

cogl/cogl-context.h

@@ -32,6 +32,7 @@
 #include "cogl-material-private.h"
 #include "cogl-atlas.h"
 #include "cogl-buffer-private.h"
+#include "cogl-bitmask.h"
 
 typedef struct
 {
@@ -87,7 +88,12 @@ typedef struct
   CoglMaterialFlushOptions current_material_flush_options;
   GArray           *current_layers;
   /* Bitmask of texture coordinates arrays that are enabled */
-  unsigned int      texcoord_arrays_enabled;
+  CoglBitmask       texcoord_arrays_enabled;
+  /* These are temporary bitmasks that are used when disabling
+     texcoord arrays. They are here just to avoid allocating new ones
+     each time */
+  CoglBitmask       texcoord_arrays_to_disable;
+  CoglBitmask       temp_bitmask;
 
   /* PBOs */
   /* This can be used to check if a pbo is bound */

cogl/cogl-internal.h

@@ -26,6 +26,7 @@
 
 #include "cogl.h"
 #include "cogl-matrix-stack.h"
+#include "cogl-bitmask.h"
 
 #ifdef COGL_HAS_XLIB_SUPPORT
 #include <X11/Xlib.h>
@@ -132,8 +133,10 @@ _cogl_get_max_texture_image_units (void);
 void
 _cogl_flush_face_winding (void);
 
+/* Disables the texcoord arrays that don't have a corresponding bit
+   set in the mask */
 void
-_cogl_disable_texcoord_arrays (unsigned int mask);
+_cogl_disable_other_texcoord_arrays (const CoglBitmask *mask);
 
 #ifdef COGL_HAS_XLIB_SUPPORT
 

cogl/cogl-journal.c

@@ -373,7 +373,6 @@ _cogl_journal_flush_texcoord_vbo_offsets_and_entries (
 {
   CoglJournalFlushState *state = data;
   int                    i;
-  unsigned int           layers_mask;
 
   _COGL_GET_CONTEXT (ctx, NO_RETVAL);
 
@@ -396,9 +395,9 @@ _cogl_journal_flush_texcoord_vbo_offsets_and_entries (
                                       TEX_STRIDE * 4 * i)));
     }
 
-  layers_mask = ~((~(unsigned int) 0) << batch_start->n_layers);
+  _cogl_bitmask_clear_all (&ctx->temp_bitmask);
-  ctx->texcoord_arrays_enabled |= layers_mask;
+  _cogl_bitmask_set_range (&ctx->temp_bitmask, batch_start->n_layers, TRUE);
-  _cogl_disable_texcoord_arrays (ctx->texcoord_arrays_enabled & ~layers_mask);
+  _cogl_disable_other_texcoord_arrays (&ctx->temp_bitmask);
 
   batch_and_call (batch_start,
                   batch_len,

cogl/cogl-path.c

@@ -263,7 +263,8 @@ _cogl_add_path_to_stencil_buffer (CoglHandle path_handle,
   GE (glStencilOp (GL_INVERT, GL_INVERT, GL_INVERT));
 
   /* Disable all client texture coordinate arrays */
-  _cogl_disable_texcoord_arrays (ctx->texcoord_arrays_enabled);
+  _cogl_bitmask_clear_all (&ctx->temp_bitmask);
+  _cogl_disable_other_texcoord_arrays (&ctx->temp_bitmask);
 
   while (path_start < path->data->path_nodes->len)
     {

cogl/cogl-primitives.c

@@ -1012,7 +1012,6 @@ cogl_polygon (const CoglTextureVertex *vertices,
   unsigned int         stride;
   gsize                stride_bytes;
   GLfloat             *v;
-  unsigned int         layers_mask;
   CoglMaterialWrapModeOverrides wrap_mode_overrides;
   CoglMaterialWrapModeOverrides *wrap_mode_overrides_p = NULL;
 
@@ -1165,9 +1164,9 @@ cogl_polygon (const CoglTextureVertex *vertices,
                              v + 3 + 2 * i));
     }
 
-  layers_mask = ~((~(unsigned int) 0) << n_layers);
+  _cogl_bitmask_clear_all (&ctx->temp_bitmask);
-  ctx->texcoord_arrays_enabled |= layers_mask;
+  _cogl_bitmask_set_range (&ctx->temp_bitmask, n_layers, TRUE);
-  _cogl_disable_texcoord_arrays (ctx->texcoord_arrays_enabled & ~layers_mask);
+  _cogl_disable_other_texcoord_arrays (&ctx->temp_bitmask);
 
   if (use_sliced_polygon_fallback)
     _cogl_texture_polygon_multiple_primitives (vertices,

cogl/cogl-vertex-buffer.c

@@ -1518,7 +1518,6 @@ enable_state_for_drawing_buffer (CoglVertexBuffer *buffer)
   GLuint       generic_index = 0;
 #endif
   unsigned long enable_flags = 0;
-  unsigned int texcoord_arrays_used = 0;
   const GList *layers;
   guint32      fallback_layers = 0;
   int          i;
@@ -1534,6 +1533,8 @@ enable_state_for_drawing_buffer (CoglVertexBuffer *buffer)
   memset (&options.wrap_mode_overrides, 0,
           sizeof (options.wrap_mode_overrides));
 
+  _cogl_bitmask_clear_all (&ctx->temp_bitmask);
+
   for (tmp = buffer->submitted_vbos; tmp != NULL; tmp = tmp->next)
     {
       CoglVertexBufferVBO *cogl_vbo = tmp->data;
@@ -1596,7 +1597,8 @@ enable_state_for_drawing_buffer (CoglVertexBuffer *buffer)
 				     gl_type,
 				     attribute->stride,
 				     pointer));
-              texcoord_arrays_used |= (1 << attribute->texture_unit);
+              _cogl_bitmask_set (&ctx->temp_bitmask,
+                                 attribute->texture_unit, TRUE);
 	      break;
 	    case COGL_VERTEX_BUFFER_ATTRIB_FLAG_VERTEX_ARRAY:
 	      enable_flags |= COGL_ENABLE_VERTEX_ARRAY;
@@ -1698,8 +1700,8 @@ enable_state_for_drawing_buffer (CoglVertexBuffer *buffer)
         }
     }
 
-  _cogl_disable_texcoord_arrays (ctx->texcoord_arrays_enabled &
+  /* Disable any tex coord arrays that we didn't use */
-                                 ~texcoord_arrays_used);
+  _cogl_disable_other_texcoord_arrays (&ctx->temp_bitmask);
 
   /* NB: _cogl_framebuffer_flush_state may disrupt various state (such
    * as the material state) when flushing the clip stack, so should

cogl/cogl.c

@@ -763,29 +763,33 @@ cogl_read_pixels (int x,
     }
 }
 
-void
+static void
-_cogl_disable_texcoord_arrays (unsigned int mask)
+_cogl_disable_other_texcoord_arrays_cb (int texcoord_array_num, gpointer data)
 {
-  int i = 0;
+  CoglContext *ctx = data;
 
-  _COGL_GET_CONTEXT (ctx, NO_RETVAL);
+  GE (glClientActiveTexture (GL_TEXTURE0 + texcoord_array_num));
-
-  /* Update the mask of arrays that are enabled */
-  ctx->texcoord_arrays_enabled &= ~mask;
-
-  /* Disable all of the texture coord arrays that have a 1 in the bit
-     position in mask */
-  while (mask)
-    {
-      if ((mask & 1))
-        {
-          GE (glClientActiveTexture (GL_TEXTURE0 + i));
   GE (glDisableClientState (GL_TEXTURE_COORD_ARRAY));
 }
 
-      i++;
+void
-      mask >>= 1;
+_cogl_disable_other_texcoord_arrays (const CoglBitmask *mask)
-    }
+{
+  _COGL_GET_CONTEXT (ctx, NO_RETVAL);
+
+  /* Set texcoord_arrays_to_disable to only contain the arrays we want
+     to disable */
+  _cogl_bitmask_clear_all (&ctx->texcoord_arrays_to_disable);
+  _cogl_bitmask_set_bits (&ctx->texcoord_arrays_to_disable,
+                          &ctx->texcoord_arrays_enabled);
+  _cogl_bitmask_clear_bits (&ctx->texcoord_arrays_to_disable, mask);
+
+  _cogl_bitmask_foreach (&ctx->texcoord_arrays_to_disable,
+                         _cogl_disable_other_texcoord_arrays_cb, ctx);
+
+  /* Update the mask of arrays that are enabled */
+  _cogl_bitmask_clear_bits (&ctx->texcoord_arrays_enabled,
+                            &ctx->texcoord_arrays_to_disable);
 }
 
 void
@@ -840,7 +844,8 @@ cogl_begin_gl (void)
   _cogl_flush_face_winding ();
 
   /* Disable all client texture coordinate arrays */
-  _cogl_disable_texcoord_arrays (ctx->texcoord_arrays_enabled);
+  _cogl_bitmask_clear_all (&ctx->temp_bitmask);
+  _cogl_disable_other_texcoord_arrays (&ctx->temp_bitmask);
 }
 
 void